Step 5: Re-wire The Tail Light

Take the battery connector closest to the power button (we are going to be running our wires through here later) and cut it in the middle. This is where we are going to add our wires from our switches.

Step 6: Zip-Tie Everything Up and Attach it to Your Bike

Zip-tie your wires to your break lines and make sure to leave enough room that you can turn your handlebars right and left without it catching on your wires. Test it out and make sure that everything is working as it should.

Lol ^^ seriously you should go on shark tank xD improve it though, too look more professional lol Btw, when you said to get the battery connector closest to the switch, will that override the switch? I have one think it's a bell light and it has 4 modes and the 3rd mode is the mode where the light stays, but when I put it on that mode and I test it out by touching the wires it works, but soon after a couple seconds later the light turns off, and idea?

You can buy v-brake levers (also work with cable pull discs) that have electric switches in them. They are sold for electric bicycles, as cutout switches that activate when braking, but can be wired to engage light systems.